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Backport "Regression test for extension nullification, nowarn for different opacities" to 3.3 LTS #270

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Merged
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Apr 23, 2025
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Backport "Regression test for extension nullification, nowarn for different opacities" to 3.3 LTS #270

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23 changes: 23 additions & 0 deletions tests/warn/i21190.scala
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Original file line number Diff line number Diff line change
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//> using options -Werror

opaque type FromEnd = Int
object FromEnd:
inline def apply(i: Int): FromEnd = i
extension (fe: FromEnd)
inline def value: Int = fe

// Warning appears when extension is in same namespace as opaque type
extension [A](a: Array[A])
inline def apply(fe: FromEnd): A =
a(a.length - 1 - FromEnd.value(fe))

class R:
def run(): String =
val xs = Array(1, 2, 3)

s"""First element = ${xs(0)}
|Last element = ${xs(FromEnd(0))}""".stripMargin

@main def test = println:
R().run()